Here is the full list of all 38 Minion Masters achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Play a friendly challenge with 3 different friends.
Win a Ranked Battle with less than 100 Health left
Complete 100 Daily Quests
Use 100 Resource Tokens
Win 500 Ranked Battles
Use 250 Power Tokens
Complete 50 Daily Quests
Complete 30 Achievements
Use 50 Resource Tokens
Craft a Legendary card
Win a Ranked battle with 8 different Masters
Complete 25 Daily Quests
Use 100 Power Tokens
Use 20 Resource Tokens
Acquire a collection of 150 cards
Complete 10 Daily Quests
Craft a Supreme card
Win 100 Ranked Battles
Craft a Rare card
Play 5 spells in a row during a Ranked Match and then win
Win 50 Ranked Battles
Reach the Silver League
Complete 15 Achievements
Acquire a collection of 100 cards
Craft a Common card
Use 25 Power Tokens
Reach the Bronze League
Complete 10 solo challenges
Create 3 decks
Watch a replay
Complete 5 solo challenges
Complete 5 Achievements
Win 10 Ranked Battles
Win against 8 different Masters
Complete 3 Daily Quests
Reach the Stone League
Acquire a collection of 50 cards
Win 3 Ranked Battles